From the trachea, air enters the, which branch out into smaller tubes called.

The correct answer is air enters the - Bronchi and smaller tubes called- Bronchioles.

Explanation:

In humans, the respiratory system includes specialized organs like nose,  the pharynx (or throat), oral cavity, larynx, the trachea, the stem bronchi.

The process of respiration starts with inhaling the air through nose and mouth which travels down to the back of your throat and windpipe called trachea. The trachea then divides into air passage tubes called bronchi which ramify within the and is known as the bronchioles.

Thus, Bronchi and bronchioles are the correct answer.

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